Use mouse to move umbrella around the screen.
A Pen by Liliana Kastilio on CodePen.
Created
April 15, 2014 15:59
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A Pen by Liliana Kastilio.
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| <body> | |
| <canvas id="myCanvas"></canvas> | |
| </body> |
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| var canvas = document.getElementById('myCanvas'); | |
| var isMouseDown = false; | |
| var isMouseMove = false; | |
| var message = ""; | |
| var isSelected = false; | |
| var mousePos = { | |
| x:0, | |
| y:0 | |
| }; | |
| var ps = []; | |
| var MAX_NUM = 800; | |
| var colors = [ '#69D2E7', '#A7DBD8', '#E0E4CC', '#F38630', '#FA6900', '#FF4E50', '#F9D423' ]; | |
| var FPS = 60; | |
| if(canvas.getContext && canvas.getContext('2d')) { | |
| context = canvas.getContext('2d'); //context | |
| canvas.width = window.innerWidth; | |
| canvas.height = window.innerHeight; | |
| canvas.style.position = 'absolute'; | |
| canvas.style.top = 0; | |
| canvas.style.bottom = 0; | |
| canvas.style.left = 0; | |
| canvas.style.right = 0; | |
| canvas.style.zIndex = -1; | |
| spawn(); | |
| var umbrella = { | |
| top: { | |
| x: 300, | |
| y: 200, | |
| r: 75, | |
| sAngle: Math.PI, | |
| eAngle: 0 | |
| }, | |
| handle: { | |
| width: 2, | |
| height: 90 | |
| } | |
| } | |
| canvas.addEventListener('mousemove', function(evt) { | |
| mousePos = getMousePos(canvas, evt); | |
| message = 'Mouse position: ' + mousePos.x + ',' + mousePos.y; | |
| writeMessage(canvas, message); | |
| isMouseMove = true; | |
| }, false); | |
| canvas.addEventListener('mousedown', function(evt) { | |
| isMouseDown = true; | |
| mousePos = getMousePos(canvas, evt); | |
| message = 'Mouse position: ' + mousePos.x + ',' + mousePos.y; | |
| writeMessage(canvas, message); | |
| }, false); | |
| canvas.addEventListener('mouseup', function(evt) { | |
| isMouseDown = false; | |
| isSelected = false; | |
| }, false); | |
| } | |
| function draw_umbrella() { | |
| //umbrella top | |
| context.beginPath(); | |
| context.arc(umbrella.top.x, umbrella.top.y, umbrella.top.r, umbrella.top.sAngle, umbrella.top.eAngle, false); | |
| context.strokeStyle ="#f6f6f6"; | |
| context.lineWidth = umbrella.handle.width; | |
| context.stroke(); | |
| //context.fillStyle="#f6f6f6"; | |
| //context.fill(); | |
| context.closePath(); | |
| //wavy bottom of umbrella | |
| context.beginPath(); | |
| context.lineWidth = umbrella.handle.width; | |
| context.arc(umbrella.top.x - 5*(umbrella.top.r/6), umbrella.top.y, umbrella.top.r/6, umbrella.top.sAngle, umbrella.top.eAngle, false); | |
| context.arc(umbrella.top.x - 3*(umbrella.top.r/6), umbrella.top.y, umbrella.top.r/6, umbrella.top.sAngle, umbrella.top.eAngle, false); | |
| context.arc(umbrella.top.x - umbrella.top.r/6, umbrella.top.y, umbrella.top.r/6, umbrella.top.sAngle, umbrella.top.eAngle, false); | |
| context.arc(umbrella.top.x + umbrella.top.r/6, umbrella.top.y, umbrella.top.r/6, umbrella.top.sAngle, umbrella.top.eAngle, false); | |
| context.arc(umbrella.top.x + 3*(umbrella.top.r/6), umbrella.top.y, umbrella.top.r/6, umbrella.top.sAngle, umbrella.top.eAngle, false); | |
| context.arc(umbrella.top.x + 5*(umbrella.top.r/6), umbrella.top.y, umbrella.top.r/6, umbrella.top.sAngle, umbrella.top.eAngle, false); | |
| context.strokeStyle ="#f6f6f6"; | |
| context.lineWidth = umbrella.handle.width; | |
| context.stroke(); | |
| //context.fillStyle="#e74c3c"; | |
| //context.fill(); | |
| context.closePath(); | |
| //umbrella handle | |
| context.beginPath(); | |
| context.arc(umbrella.top.x - umbrella.top.r/6, umbrella.top.y + umbrella.handle.height, umbrella.top.r/6, umbrella.top.eAngle, umbrella.top.sAngle, false); | |
| context.moveTo(umbrella.top.x, umbrella.top.y); | |
| context.lineTo(umbrella.top.x, umbrella.top.y + umbrella.handle.height); | |
| context.strokeStyle ="#f6f6f6"; | |
| context.lineWidth = umbrella.handle.width; | |
| context.stroke(); | |
| context.closePath(); | |
| } | |
| function writeMessage(canvas, message) { | |
| context.clearRect(0, 0, 100, 40); | |
| context.font = '18pt Calibri'; | |
| context.fillStyle = 'black'; | |
| context.fillText(message, 10, 25); | |
| } | |
| function getMousePos(canvas, evt) { | |
| var rect = canvas.getBoundingClientRect(); | |
| return { | |
| x: evt.clientX - rect.left, | |
| y: evt.clientY - rect.top | |
| }; | |
| } | |
| function reset() { | |
| canvas.width = canvas.width; | |
| } | |
| //create the particles | |
| function spawn() { | |
| for(var i=0; ps.length < MAX_NUM; i++) { | |
| ps[i] = { x: Math.random()*window.innerWidth, | |
| y: Math.random()*window.innerHeight/2, | |
| r: Math.random()*5, | |
| c: colors[Math.floor(Math.random()*colors.length)] | |
| }; | |
| } | |
| } | |
| function update_particles() { | |
| for(var i=0; i<ps.length; i++) { | |
| if(Math.pow((ps[i].x - umbrella.top.x),2) + Math.pow(ps[i].y - umbrella.top.y, 2) > Math.pow(umbrella.top.r,2)){ | |
| ps[i].y += 0.98; | |
| ps[i].x += (Math.random() * 2); | |
| //ps[i].r = Math.random()*5; | |
| } | |
| else if(ps[i].y > umbrella.top.y) | |
| ps[i].x = umbrella.top.r - umbrella.top.x; | |
| } | |
| } | |
| function reset_particles() { | |
| //reset the x and y coordinates if leaves the canvas | |
| for(var i=0; i<ps.length; i++) { | |
| //reset if y or coordinate has left the canvas | |
| if(ps[i].y > canvas.height) { | |
| ps[i].y = Math.random()*window.innerHeight/2; | |
| ps[i].color = colors[Math.floor(Math.random() * colors.length)]; | |
| } | |
| //reset if x or coordinate has left the canvas | |
| if(ps[i].x > canvas.width || ps[i].x < 0){ | |
| ps[i].x = Math.random()*window.innerWidth; | |
| ps[i].color = colors[Math.floor(Math.random() * colors.length)]; | |
| } | |
| } | |
| } | |
| function draw_particles() { | |
| canvas.width = window.innerWidth; | |
| canvas.height = window.innerHeight; | |
| for(var i=0; i<ps.length; i++) { | |
| context.beginPath(); | |
| context.arc( ps[i].x, ps[i].y, ps[i].r, 0, 6); | |
| context.fillStyle = ps[i].c; | |
| context.fill(); | |
| } | |
| } | |
| function update() { | |
| writeMessage(canvas, message); | |
| update_particles(); | |
| draw_particles(); | |
| reset_particles(); | |
| draw_umbrella(); | |
| if(Math.pow((mousePos.x - umbrella.top.x),2) + Math.pow(mousePos.y - umbrella.top.y, 2) < Math.pow(umbrella.top.r,2) && isMouseDown) //console.log("INSIDE: " + Math.pow((mousePos.x - umbrella.top.x),2) + " " + Math.pow(mousePos.y - umbrella.top.y, 2) + " r^2: " + Math.pow(umbrella.top.r,2)); | |
| //console.log("Mousedown: " + isMouseDown + " mousemove: " + isMouseMove); | |
| isSelected = true; | |
| if(isMouseDown & isMouseMove & isSelected) { | |
| //console.log("Mousedown: " + isMouseDown + " mousemove: " + isMouseMove); | |
| umbrella.top.x = mousePos.x; | |
| umbrella.top.y = mousePos.y; | |
| } | |
| } | |
| setInterval(function() { | |
| reset(); | |
| update(); | |
| }, 1); | |
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| body { | |
| width: 100%; | |
| height: 100%; | |
| margin: 0 auto; | |
| background-color: #e74c3c; | |
| } | |
| canvas { | |
| height: auto; | |
| width:auto; | |
| } |
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